Josselin Judith

Senior freelance (12 years of experience) offering comprehensive IT solutions: from hardware setup to advanced software security. I combine SysAdmin expertise, automation development, and cybersecurity to protect and modernize your SME infrastructures.

My key expertise:

1. Infrastructure & Hardware:

Custom PC Builds: Tailored assembly according to budget and technical needs (gaming, professional, server).

Linux Deployment: Complete installation and configuration of workstations (Linux Desktop) and servers (Debian, Ubuntu, RHEL).

Virtualization: Setting up KVM, Proxmox, and Docker container environments to optimize resources.

2. Cybersecurity & Audit:

Proactive Security: OS hardening, firewalls (iptables/nftables), IDS/IPS, and sensitive data encryption.

Basic vulnerability audits and penetration testing.

Implementation of Business Continuity Plans (BCP) and encrypted automated backups against ransomware.

3. Automation & Monitoring:

Bash/Python scripts for self-management (backup, deployment, maintenance).

Real-time monitoring via Nagios, Zabbix, or Grafana for immediate alerts.

Database Administration (MySQL, PostgreSQL) and networks (DNS/DHCP/SSH).

"Turnkey" Added Value: Unlike remote providers, I manage the entire cycle: from physical server/PC assembly to OS installation, network configuration, security hardening, and user training. This comprehensive approach ensures perfect consistency between hardware and software.

Achievements: Secured e-commerce infrastructure (-95% of vulnerabilities), migrated legacy systems to secure virtualization, deployed complete IT parks.

Within OpenClassrooms' educational department, I was tasked with intervening in the complete lifecycle of web projects, combining rigorous technical integration and software quality assurance. My primary mission was to translate complex graphic designs into performant, accessible, and fully responsive web interfaces, while ensuring strict compliance with WCAG and RGAA standards.

My technical contributions:

Front-End Integration: Development of semantic HTML5 pages and advanced CSS3 stylesheets (Flexbox, Grid, animations). Optimization of loading times (Core Web Vitals) and multi-device adaptation (mobile, tablet, desktop).

Testing & Quality: Design and execution of functional and non-functional test plans. Regression detection, cross-browser compatibility validation (Chrome, Firefox, Safari, Edge), and detailed bug reporting with proposed fixes.

Security & Compliance: Active participation in the analysis of cybersecurity risks on developed applications. Verification of common vulnerabilities (XSS, SQL injections) before production deployment and implementation of secure coding best practices.

Collaboration: Close collaboration with UX/UI teams, back-end developers, and project managers. Use of Git for version control and continuous integration in agile environments (Scrum/Kanban).

Key results:

Delivery of training modules with a high customer satisfaction rate thanks to a fluid and intuitive interface.

Significant reduction in production bug reports after implementing rigorous validation processes.

Complete technical documentation provided to facilitate future maintenance of source codes by internal teams.

This experience has strengthened my mastery of modern web technologies and my ability to deliver robust solutions in a demanding environment.